CN113708488B

CN113708488B - Relay protection system hardware architecture

Info

Publication number: CN113708488B
Application number: CN202110929305.0A
Authority: CN
Inventors: 高吉普; 辛明勇; 徐长宝; 代奇迹; 祝健杨; 李肖博; 陶伟; 陈军健
Original assignee: Guizhou Power Grid Co Ltd; Southern Power Grid Digital Grid Research Institute Co Ltd
Current assignee: Guizhou Power Grid Co Ltd; Southern Power Grid Digital Grid Research Institute Co Ltd
Priority date: 2021-08-13
Filing date: 2021-08-13
Publication date: 2023-01-24
Anticipated expiration: 2041-08-13
Also published as: CN113708488A

Abstract

The application relates to a relay protection system hardware architecture, which comprises a direct current sampling module, an alternating current sampling module, a neutral line sampling module, a logic processing module and an execution module; the direct current sampling module, the alternating current sampling module and the neutral line sampling module are all connected with the logic processing module, the logic processing module is connected with the execution module, and the execution module is used for being connected with a protected object. The direct current sampling module, the alternating current sampling module and the neutral line sampling module are respectively used for acquiring direct current parameters, alternating current parameters and neutral line electrical parameters of a protected object to obtain corresponding sampling signals and sending the sampling signals to the logic processing module; the logic processing module is used for acquiring a sampling signal, judging whether a protection action needs to be executed according to the sampling signal, and sending a control signal to the execution module when the protection action needs to be executed; the control signal is used for instructing the execution module to execute relay protection on the protected object. The hardware architecture of the relay protection system can expand the application scene of the relay protection system.

Description

Relay protection system hardware architecture

Technical Field

The application relates to the technical field of relay protection, in particular to a relay protection system hardware architecture.

Background

As is well known, relay protection is an important measure for detecting faults or abnormal conditions occurring in an electric power system to send out an alarm signal or directly isolating and removing a fault part, and is an important guarantee for the safety of the electric power system and elements thereof. With the rapid development of the power industry, the capacity and scale of a power system are increasing day by day, and the requirement on the hardware architecture of a relay protection system is continuously increased.

The traditional relay protection system hardware architecture is provided with a sampling module corresponding to the type of a protected object, a sampling signal is obtained by collecting the electrical physical quantity of the protected object, the sampling signal is compared with a preset threshold value, and whether protection action needs to be executed or not is judged. Therefore, the traditional relay protection system hardware architecture is only suitable for a single type of protected object, and has the defect of limited application scene.

Disclosure of Invention

Therefore, it is necessary to provide a relay protection system hardware architecture to expand an application scenario of the relay protection system hardware architecture, in order to solve the above technical problems.

A relay protection system hardware architecture comprises a direct current sampling module, an alternating current sampling module, a neutral line sampling module, a logic processing module and an execution module; the direct current sampling module, the alternating current sampling module and the neutral line sampling module are all connected with the logic processing module, the logic processing module is connected with the execution module, and the execution module is used for connecting a protected object;

the direct current sampling module, the alternating current sampling module and the neutral line sampling module are respectively used for acquiring direct current parameters, alternating current parameters and neutral line electrical parameters of a protected object to obtain corresponding sampling signals and sending the sampling signals to the logic processing module;

the logic processing module is used for acquiring the sampling signal, judging whether a protection action needs to be executed according to the sampling signal, and sending a control signal to the execution module when the protection action needs to be executed; the control signal is used for instructing the execution module to execute relay protection on the protected object.

In one embodiment, the hardware architecture of the relay protection system further includes a conversion module, and the conversion module is connected to the dc sampling module, the ac sampling module, the neutral sampling module, and the logic processing module.

In one embodiment, the conversion module includes a first sorting unit and a first conversion unit, the first sorting unit connects the dc sampling module and the first conversion unit, and the first conversion unit connects the logic processing module.

In one embodiment, the conversion module comprises a signal identification unit, and the signal identification unit is connected with the neutral line sampling module and the logic processing module.

In one embodiment, the alternating current sampling module comprises a current mutual inductance unit and a voltage mutual inductance unit, and the conversion module comprises a data selection unit, a second sorting unit, a second conversion unit, a third sorting unit and a third conversion unit; the data selection unit is connected with the current mutual inductance unit, the voltage mutual inductance unit, the second arrangement unit and the third arrangement unit; the second conversion unit is connected with the second sorting unit and the logic processing module; and the third conversion unit is connected with the third sorting unit and the logic processing module.

In one embodiment, the ac sampling module further includes a synchronous acquisition unit and a phase-locked frequency multiplication unit, the synchronous acquisition unit is connected to the current transformer unit and the voltage transformer unit, and the phase-locked frequency multiplication unit is connected to the synchronous acquisition unit and the logic processing module.

In one embodiment, the hardware architecture of the relay protection system further includes a display module, and the display module is connected to the logic processing module.

In one embodiment, the display module comprises a pulse generation unit, an isolation unit and a display unit, wherein the pulse generation unit is connected with the logic processing module, and the isolation unit is connected with the pulse generation unit and the display unit.

In one embodiment, the hardware architecture of the relay protection system further includes at least one of a storage module and a communication module connected to the logic processing module.

In one embodiment, the execution module includes an overvoltage protection unit, a threshold protection unit, and a lockout unit, and the overvoltage protection unit, the threshold protection unit, and the lockout unit are all connected to the logic processing module.

According to the relay protection system hardware architecture, the direct current sampling module, the alternating current sampling module and the neutral line sampling module are configured to be respectively used for collecting direct current parameters, alternating current parameters or neutral line electrical parameters of a protected object, different sampling modules can be started according to the type of the protected object, relay protection of various types of protected objects is achieved, and the application scene of the relay protection system hardware architecture is favorably expanded.

Drawings

Fig. 1 is a block diagram of a hardware architecture of a relay protection system in an embodiment;

fig. 2 is a block diagram of a hardware architecture of a relay protection system in another embodiment;

FIG. 3 is a block diagram of the AC sampling module, conversion module, and logic processing module of an embodiment;

FIG. 4 is a block diagram of the components of an AC sampling module in one embodiment;

fig. 5 is a block diagram illustrating a hardware architecture of a relay protection system according to another embodiment;

FIG. 6 is a block diagram of the display module in an embodiment.

Detailed Description

In order to make the objects, technical solutions and advantages of the present application more apparent, the present application is described in further detail below with reference to the accompanying drawings and embodiments. It should be understood that the specific embodiments described herein are merely illustrative of the present application and are not intended to limit the present application.

Unless defined otherwise, all technical and scientific terms used herein have the same meaning as commonly understood by one of ordinary skill in the art to which this application belongs. The terminology used herein in the description of the present application is for the purpose of describing particular embodiments only and is not intended to be limiting of the application.

It will be understood that, as used herein, the terms "first," "second," and the like may be used herein to describe various elements, but these elements are not limited by these terms. These terms are only used to distinguish one element from another. For example, a first conversion unit may be referred to as a second conversion unit, and similarly, a second conversion unit may be referred to as a first conversion unit, without departing from the scope of the present application. Both the first conversion unit and the second conversion unit are conversion units, but they are not the same conversion unit.

It is to be understood that "connection" in the following embodiments is to be understood as "electrical connection", "communication connection", and the like if the connected circuits, modules, units, and the like have communication of electrical signals or data with each other.

As used herein, the singular forms "a", "an" and "the" may include the plural forms as well, unless the context clearly indicates otherwise. It will be further understood that the terms "comprises/comprising," "includes" or "including," etc., specify the presence of stated features, integers, steps, operations, components, parts, or combinations thereof, but do not preclude the presence or addition of one or more other features, integers, steps, operations, components, parts, or combinations thereof. Also, as used in this specification, the term "and/or" includes any and all combinations of the associated listed items.

In one embodiment, a hardware architecture of a relay protection system is provided, as shown in fig. 1, the hardware architecture of the relay protection system includes a dc sampling module 100, an ac sampling module 200, a neutral sampling module 300, a logic processing module 500, and an execution module 600. The direct current sampling module 100, the alternating current sampling module 200 and the neutral line sampling module 300 are all connected with the logic processing module 500, the logic processing module 500 is connected with the execution module 600, and the execution module 600 is used for connecting with a protected object. The direct current sampling module 100, the alternating current sampling module 200 and the neutral line sampling module 300 are respectively used for acquiring direct current parameters, alternating current parameters and neutral line electrical parameters of a protected object to obtain corresponding sampling signals and sending the corresponding sampling signals to the logic processing module 500; the logic processing module 500 is configured to obtain a sampling signal, determine whether a protection action needs to be executed according to the sampling signal, and send a control signal to the execution module 600 when the protection action needs to be executed. The control signal is used to instruct the execution module 600 to execute relay protection on the protected object.

The direct current sampling module 100 and the neutral line sampling module 300 may be circuit modules including sensing devices, and implementing electrical signal sampling by sensing measured electrical parameters through the sensing devices; or a circuit module which comprises a voltage division or shunt device and carries out electric signal sampling based on the voltage division or shunt principle. The ac sampling module 200 may be a circuit module for sampling ac signals based on the mutual inductance principle, or may be a circuit module including a sampling chip for sampling ac signals based on a software algorithm. The logic processing module 500 may be a circuit module including various controllers or control chips and peripheral circuits thereof and having a logic operation function. The control chip may be an MCU (micro controller Unit) chip, a DSP (Digital Signal processing) chip, or an FPGA (Field Programmable Gate Array) chip. The execution module 600 may be a circuit module that includes a protection device and performs relay protection on a protected object. In one embodiment, the execution module 600 includes one or more of an overcurrent protection unit, an overvoltage protection unit, a threshold protection unit, a latch protection unit, and a differential protection unit, and each protection unit is connected to the logic processing module 500 and the protected object, and is respectively configured to execute a corresponding type of protection action.

Further, the dc sampling module 100 is configured to collect dc parameters of the protected object, such as a bus voltage and a bus current of a dc bus of the power system; the ac sampling module 200 is used to collect ac parameters of the protected object, such as three-phase voltage and three-phase current of the power system; the neutral sampling module 300 is used to collect neutral electrical parameters of the protected object, such as the voltage and current of the neutral of the power system. Different protected objects are different from the power system in connection relation, related electrical parameters are different, and corresponding sampling modules can be selectively started to execute a relay protection function according to the types of the protected objects. Specifically, the corresponding sampling module performs electrical signal acquisition to obtain a sampling signal and sends the sampling signal to the logic processing module 500. The logic processing module 500 determines whether a protection action needs to be executed according to the sampling signal, and sends a control signal to the execution module 600 to instruct the execution module 600 to execute relay protection on the protected object when the protection action needs to be executed. Further, the logic processing module 500 is further configured to obtain the action status of the execution module 600 to determine whether the execution module 600 has executed the protection action.

It should be noted that, the manner for the logic processing module 500 to determine whether the protection action needs to be executed according to the sampling signal is not unique. For example, the logic processing module 500 may determine whether the sampling signal satisfies a preset condition, and send a control signal to the execution module 600 when the sampling signal satisfies the preset condition. The preset condition may be a pre-stored threshold, or may be a correlation between different types of sampling signals. Further, the preset threshold may be a standard value, or a threshold interval including an upper limit and a lower limit. In addition, corresponding preset conditions may be set for different types of sampling signals, and when one or more of the sampling signals satisfy the preset conditions, the execution module 600 is controlled to execute a protection action. In one embodiment, the preset condition is that the change condition of the neutral line sampling signal is within a change threshold range, and the alternating current sampling signal is smaller than a preset alternating current threshold.

Further, the logic processing module 500 may further respectively determine whether the different types of sampling signals satisfy corresponding preset conditions, and output a control signal according to the determination result and the corresponding relationship between the determination result and the protection action type, so as to control the execution module 600 to execute the corresponding type of protection action. For example, the logic processing module 500 may control the execution module 600 to perform the over-current protection action when the current signal exceeds a preset current threshold.

In addition, in one embodiment, the hardware architecture of the relay protection system is further configured with a power module, which is connected to the dc sampling module 100, the ac sampling module 200, the neutral line sampling module 300, the logic processing module 500 and the execution module 600, and is configured to provide operating power to each module. Specifically, the power module may be a power supply plug for obtaining electric energy from an external power source; or a circuit module which comprises an energy storage device and can output electric energy outwards. The energy storage device can be an energy storage battery pack or a super capacitor. Further, in an embodiment, the power module may further include a voltage conversion unit for simultaneously outputting a plurality of voltages to match the usage requirements of different types of loads.

According to the hardware architecture of the relay protection system, the direct current sampling module 100, the alternating current sampling module 200 and the neutral line sampling module 300 are configured to be respectively used for collecting direct current parameters, alternating current parameters or neutral line electrical parameters of a protected object, different sampling modules can be started according to the type of the protected object, relay protection of various types of protected objects is further achieved, and the application scene of the hardware architecture of the relay protection system is favorably expanded.

In one embodiment, as shown in fig. 2, the hardware architecture of the relay protection system further includes a conversion module 400, and the conversion module 400 is connected to the dc sampling module 100, the ac sampling module 200, the neutral sampling module 300, and the logic processing module 500.

The conversion module 400 is a circuit module capable of performing conversion processing on an input signal, where the conversion processing may be one or more of filtering, amplifying, voltage stabilizing, and isolating, and correspondingly, the conversion module 400 may include one or more of a filtering circuit, an amplifying circuit, a voltage stabilizing circuit, a digital-to-analog conversion circuit, an analog-to-digital conversion circuit, and an isolating circuit.

Specifically, the initial sampling signals acquired by the dc sampling module 100, the ac sampling module 200, and the neutral line sampling module 300 are processed by the conversion module 400 to obtain processed sampling signals, and the processed sampling signals are sent to the logic processing module 500.

In the above embodiment, after the configuration conversion module 400 processes the initial sampling signal, the processed sampling signal is sent to the logic processing module 500, which is beneficial to improving the working efficiency of the logic processing module 500, and further improving the protection effect.

In one embodiment, as shown in fig. 3, the conversion module 400 includes a first sorting unit 410 and a first conversion unit 420, the first sorting unit 410 is connected to the dc sampling module 100 and the first conversion unit 420, and the first conversion unit 420 is connected to the logic processing module 500.

The first sorting unit 410 may be a circuit unit including one or more of a filter circuit, an amplifier circuit, and a voltage regulator circuit. The first conversion unit 420 may be various types of analog-to-digital converters, such as an indirect analog-to-digital converter or a direct analog-to-digital converter. In an embodiment, the first conversion unit 420 is a dual-channel analog-to-digital converter, which can convert an analog sampling signal into a digital signal and send the digital signal to the logic processing module 500, and can obtain a feedback signal of the logic processing module 500 to determine that the logic processing module 500 receives the corresponding digital sampling signal.

In one embodiment, with continued reference to fig. 3, the conversion module 400 further includes a signal identification unit 430, and the signal identification unit 430 is connected to the neutral line sampling module 300 and the logic processing module 500.

The signal identifying unit 430 is a unit for determining the type of the input signal. As mentioned above, the neutral electrical parameter collected by the neutral sampling module 300 may be a voltage signal and/or a current signal. The signal recognition unit 430 is configured to obtain and recognize a neutral line sampling signal, determine the type of the neutral line sampling signal, obtain a signal type identifier, and send a corresponding signal with the identifier to the logic processing module 500, so that the logic processing module 500 performs analysis and processing on the corresponding signal.

In one embodiment, with continued reference to fig. 3, the ac sampling module 200 includes a current transformer unit 210 and a voltage transformer unit 220, and the conversion module 400 further includes a data selection unit 430, a second sorting unit 440, a second conversion unit 450, a third sorting unit 460, and a third conversion unit 470. The data selection unit 430 is connected with the current transformer unit 210, the voltage transformer unit 220, the second sorting unit 440 and the third sorting unit 460; the second conversion unit 450 is connected with the second sorting unit 440 and the logic processing module 500; the third conversion unit 470 is connected to the third collating unit 460 and the logic processing module 500.

The data selecting unit 430 is a circuit unit that can transmit data of multiple channels to a single common data channel to realize a data selecting function. For the specific limitations of the second sorting unit 440 and the third sorting unit 460, please refer to the first sorting unit 410, and for the specific limitations of the second converting unit 450 and the third converting unit 470, please refer to the first converting unit 420, which is not described herein again. Further, the second sorting unit 440 and the third sorting unit 460, and the second converting unit 450 and the third converting unit 470 may be the same type of circuit unit, or different types of circuit units.

Specifically, the data selecting unit 430 is configured to obtain a current initial sampling signal and a voltage initial sampling signal of the current transformer unit 210 and the voltage transformer unit 220, and send one of the current initial sampling signal and the voltage initial sampling signal to the second sorting unit 440 and the third sorting unit 460 at the rear end for subsequent processing. For example, if the selected data is the current initial sampling signal, the processing procedure is: after the current initial sampling signal collected by the current transformer unit 210 is processed by the second sorting unit 440 and the second conversion unit 450, a first current signal is obtained and sent to the logic processing module 500; the current initial sampling signal is further processed by the third sorting unit 460 and the third converting unit 470 to obtain a second current signal, which is sent to the logic processing module 500. Then, the logic processing module 500 determines whether the first current signal and the second current signal satisfy a preset condition according to the first current signal and the second current signal, and starts a protection action if the first current signal and the second current signal satisfy the preset condition. The preset condition may be a preset current threshold or a preset relational expression. For example, the logic processing module 500 may initiate a protection action when one of the first current signal or the second current signal satisfies a preset current threshold.

In the above embodiment, the specific composition of the conversion module 400 is given, which is equivalent to configuring different conversion units for different sampling modules to process corresponding sampling signals, which is beneficial to further improving the quality of the sampling signals and improving the processing efficiency of the logic processing module 500.

In one embodiment, as shown in fig. 4, the ac sampling module 200 further includes a synchronous obtaining unit 230 and a phase-locked frequency doubling unit 240, the synchronous obtaining unit 230 is connected to the current transformer unit 210 and the voltage transformer unit 220, and the phase-locked frequency doubling unit 240 is connected to the synchronous obtaining unit 230 and the logic processing module 500.

The synchronous acquiring unit 230 is a circuit unit that includes a clock calibration function and can acquire a synchronous sampling signal. The phase-locked frequency multiplication unit 240 refers to a circuit unit that can implement a frequency multiplication function. Specifically, after the synchronous acquisition unit 230 acquires the current sampling signal and the voltage sampling signal that are sampled synchronously, the corresponding signals are sent to the phase-locked frequency doubling unit 240, a second ac sampling signal that is in a multiple relation with the corresponding signals is generated, and sent to the logic processing module 500, and the logic processing module 500 may correct the first ac sampling signal sent by the conversion module 400 according to the second sampling signal, and then perform subsequent analysis and processing.

In the above embodiment, the synchronous obtaining unit 230 and the phase-locked frequency doubling unit 240 are configured, which is beneficial to improving the stability of the ac sampling signal and improving the processing efficiency of the logic processing module 500.

In one embodiment, as shown in fig. 5, the hardware architecture of the relay protection system further includes a display module 700, and the display module 700 is connected to the logic processing module 500.

The display module 700 may include, among other things, a display device and its peripheral circuits. The display device can be a nixie tube, a display lamp or a display screen. Specifically, on one hand, the logic processing module 500 acquires a sampling signal, determines whether a protection action needs to be executed according to the sampling signal, and sends a control signal to the execution module 600 to instruct the execution module 600 to execute relay protection on a protected object when the protection action needs to be executed; on the other hand, the working states of the execution module 600, the power supply module, the conversion module 400 and other functional modules are also obtained, and a display signal is sent to the display module 700 according to the working states, so that the working personnel can obtain the operation condition of the current relay protection system in time.

In the above embodiment, the configuration display module 700 displays the working state, so that the working personnel can know the operation condition of the current relay protection system in time, and further obtain the operation state of the protected object, which is beneficial to improving the working efficiency.

In one embodiment, as shown in fig. 6, the display module 700 includes a pulse generating unit 710, an isolating unit 720 and a display unit 730, the pulse generating unit 710 is connected to the logic processing module 500, and the isolating unit 720 is connected to the pulse generating unit 710 and the display unit 730.

The pulse generating unit 710 is a circuit unit having a pulse signal output function. The type of the pulse signal is not exclusive, and may be, for example, a trapezoidal wave, triangular wave, or sawtooth wave pulse signal. The isolation unit 720 is a circuit unit that can achieve mutual isolation of input signals and output signals. The isolation unit 720 may be a magnetic isolation unit or an optoelectronic isolation unit. The display unit 730 may be a nixie tube, a display lamp or a display screen.

Specifically, the logic processing module 500 obtains the working state of the execution module 600, and sends a corresponding trigger signal to the pulse generating unit 710 according to the working state, controls the pulse generating unit 710 to generate a corresponding pulse, and instructs the display unit 730 at the rear end to display corresponding information after passing through the isolating unit 720.

In the above embodiment, the isolation unit 720 is configured between the logic processing module 500 and the display unit 730, so that signal interference can be isolated, which is beneficial to improving the reliability of the relay protection system.

In an embodiment, please continue to refer to fig. 5, the hardware architecture of the relay protection system further includes at least one of a storage module 800 and a communication module 900 connected to the logic processing module 500.

The memory module 800 may be various types of memories or memory chips. The communication module 900 may be a wired communication module or a wireless communication module. The wired communication module CAN be a bus communication module, such as a USB communication module, a 485 communication module, a CAN communication module or an RS232 communication module, and CAN also be used. The wireless communication module can be a Bluetooth communication module, a wireless communication module or a cellular communication module.

Specifically, the logic processing module 500 may implement interaction with a terminal and a server through the communication module 900. The terminal comprises but is not limited to various smart phones, smart wearable devices, tablets, computers and the like. For example, a worker may use a terminal to send the type of protected object to the logic processing module 500 through the communication module 900 so that the logic processing module 500 automatically enables the corresponding sampling module. Further, the logic processing module 500 may further send the determination result to the storage module 800, so as to facilitate subsequent analysis and invocation. It should be noted that the determination result may include the corresponding electrical parameter of the protected object acquired by the sampling module, the determination result of whether the logic processing module 500 needs to execute the protection action according to the electrical parameter, and the execution condition of the protection action of the execution module 600.

In one embodiment, the memory module 800 includes data memory and cache memory, and the communication module 900 is a USB communication module. The data memory is connected to the logic processing module 500 and to the cache memory, which is connected to the USB communication module for connection to the terminal. Specifically, the logic processing module 500 may further implement communication with the terminal through the data memory, the cache memory, and the USB communication module in sequence.

In the above embodiment, the storage module 800 and the communication module 900 are configured, so that convenience of information transmission between a worker and a relay protection system can be improved, and work efficiency is improved.

The technical features of the above embodiments can be arbitrarily combined, and for the sake of brevity, all possible combinations of the technical features in the above embodiments are not described, but should be considered as the scope of the present specification as long as there is no contradiction between the combinations of the technical features.

The above examples only express several embodiments of the present application, and the description thereof is more specific and detailed, but not construed as limiting the scope of the invention. It should be noted that, for a person skilled in the art, several variations and modifications can be made without departing from the concept of the present application, which falls within the scope of protection of the present application. Therefore, the protection scope of the present patent shall be subject to the appended claims.

Claims

1. A relay protection system hardware architecture is characterized in that the hardware architecture is applied to relay protection of a power system and comprises a direct current sampling module, an alternating current sampling module, a neutral line sampling module, a logic processing module, a conversion module and an execution module; the direct current sampling module, the alternating current sampling module and the neutral line sampling module are all connected with the logic processing module, the logic processing module is connected with the execution module, and the execution module is used for being connected with a protected object; the conversion module is connected with the direct current sampling module, the alternating current sampling module, the neutral line sampling module and the logic processing module; the protected object comprises a direct current bus and a neutral line of a power system;

the conversion module comprises a first sorting unit and a first conversion unit, the first sorting unit is connected with the direct current sampling module and the first conversion unit, and the first conversion unit is connected with the logic processing module; the first conversion unit is a dual-channel analog-to-digital converter, and is used for converting the analog sampling signal corresponding to the direct current parameter into a digital signal and then sending the digital signal to the logic processing module, and is also used for acquiring a feedback signal of the logic processing module to determine that the logic processing module receives the digital signal;

the alternating current sampling module comprises a current mutual inductance unit and a voltage mutual inductance unit, and the conversion module further comprises a data selection unit, a second sorting unit, a second conversion unit, a third sorting unit and a third conversion unit; the data selection unit is connected with the current transformer unit, the voltage transformer unit, the second sorting unit and the third sorting unit; the second conversion unit is connected with the second sorting unit and the logic processing module; the third conversion unit is connected with the third sorting unit and the logic processing module;

the current initial sampling signal collected by the current mutual inductance unit is processed by the second sorting unit and the second conversion unit to obtain a first current signal, and the first current signal is sent to the logic processing module; the current initial sampling signal is further processed by the third sorting unit and the third conversion unit to obtain a second current signal, and the second current signal is sent to the logic processing module; when one of the first current signal and the second current signal meets a preset current threshold, the logic processing module determines that current sampling signals corresponding to the first current signal and the second current signal meet a preset condition;

the logic processing module is used for acquiring sampling signals, respectively judging whether the sampling signals of different types meet corresponding preset conditions, and outputting control signals under the condition that a plurality of sampling signals meet the preset conditions; the preset condition comprises that the change value of the neutral line electric sampling signal corresponding to the neutral line electric parameter is within the range of a change threshold value, and the alternating current sampling signal corresponding to the alternating current electric parameter is smaller than a preset alternating current threshold value; the control signal is used for instructing the execution module to execute relay protection on the protected object;

the logic processing module is further configured to obtain an action condition of the execution module to determine whether the execution module has executed a protection action corresponding to the control signal.

2. The relay protection system hardware architecture of claim 1, wherein the execution module comprises one or more of an overcurrent protection unit, an overvoltage protection unit, a threshold protection unit, a latch-up protection unit, and a differential protection unit connected to the logic processing module.

3. The relay protection system hardware architecture of claim 1, further comprising a power module connected to the dc sampling module, the ac sampling module, the neutral sampling module, the logic processing module, the conversion module, and the execution module.

4. The relay protection system hardware architecture of claim 1, wherein the conversion module comprises a signal identification unit, and the signal identification unit is connected with the neutral sampling module and the logic processing module.

5. The relay protection system hardware architecture of claim 1, wherein the ac sampling module further comprises a synchronous acquisition unit and a phase-locked frequency multiplication unit, the synchronous acquisition unit is connected to the current transformer unit and the voltage transformer unit, and the phase-locked frequency multiplication unit is connected to the synchronous acquisition unit and the logic processing module.

6. The relay protection system hardware architecture according to any one of claims 1 to 5, further comprising a display module, wherein the display module is connected to the logic processing module.

7. The relay protection system hardware architecture of claim 6, wherein the display module comprises a pulse generation unit, an isolation unit and a display unit, the pulse generation unit is connected to the logic processing module, and the isolation unit is connected to the pulse generation unit and the display unit.

8. The relay protection system hardware architecture of any one of claims 1 to 5, further comprising at least one of a storage module and a communication module connected to the logic processing module.

9. The relay protection system hardware architecture of claim 8, wherein the storage module comprises a data memory and a cache memory, and the communication module is a USB communication module.

10. The relay protection system hardware architecture according to any one of claims 1 to 5, wherein the execution module includes an overvoltage protection unit, a threshold protection unit, and a locking unit, and the overvoltage protection unit, the threshold protection unit, and the locking unit are all connected to the logic processing module.